Well thanks Jeff (F.A.B. father :-)), but it didn't work .
I disabled both master and slave UDMA .

The crackling was loud yesterday until i installed the 428v driver from VIA .
Now it's softer/high frequency (like a 33.3rpm record)

I just installed the latest Via 430 a few minutes ago with no improvement .
Any suggestion ??
Is there some good/cheap soundcards that works flawlessly with a Via mainboard ?? ( For recording ).

Thanks again , Stephane